Georg hummel



No Model.)-

G.HUMMEL. ALTBRNATING CURRENT METER.

Patented Mar. 15, 1898.

FIG; I

FIQZ- Nl'lED STATES PATENT OFFICE.

GEORG HUMMEL, OF MUNICH, GERMANY.

ALTE RNATlNG-CURRENT METER.

SPECIFICATION forming part of Letters latent No. 600,616, dated March 15, 1898.

Application filed October 30, 1897. SerialNo. 656,889- (No model.) Patented in Hungary December 13, 1895, No. 4,911; in wi z l n January 2, 1896,1 T0.11,553; in England January 8,1B96,N0.5f13 in Italy February 17,1896, XXXI,40,58'7., and LXXIX, 375; in France April 20, 1896, No. 252,997; in Spain April 26, 1896,110. 18,523, and in Austria July 10,

To all whom it may concern:

Be it known that I, GEORG HUMMEL, a subject of the King of Bavaria, residing at Munich, in the Kingdom of Bavaria, German Empire, have invented certain new and useful Improvements in Alternating-Current Meters, (for which I have obtained Letters Patent in England, No. 543- of 1896, dated January 8, 1896; in France, No. 252,997, dated April 20, 1896; in Austria, No. 46/2,?35, dated July 10, 1896; in Hungary, No. 4,911, dated December 13, 1895; in Italy, Reg. Gen. Vol. XXXI, No. 40,587, Reg. Att., Vol. LXXIX, No. 375, dated February 17, 1896; in Switzerland, No. 11,553, dated January 2, 1896; and in Spain, No. 18,523, dated April 26, 1896,) of which the following is a specification.

My invention relates to alternating-current meters of the Ferraris motor type, and consists, essentially, in an alternating-current meter of the Ferraris motor type, wherein a lag of approximately ninety degrees between the main and shunt magnetizing influences is brought about without the necessity of introducing a separate inductive resistance, which object is attained by the arrangement and disposition of the coils and other parts generating the magnetic field of the meter.

My invention will be understood by referring to the accompanying drawings, in which Figure 1 is a vertical section of a meter embodying my invention, the feed-circuits being shown in diagram. Fig. 2 is a plan of the same meter, likewise showing the feed-circuits in diagram; and Fig. 3 is an enlarged detailed sectional View showing the main magnetizing-circuit in diagram and its disposition about the fixed armature, as will be explained. In the drawings, E is a U -shaped iron core upon which shunt-coils N are wound, which shunt-coils are taken off the main circuit in the usual manner.

H H are the main or series coils of the meter, through which the current to be measured passes. As shown in the drawings, this main coil 11 is laid in grooves or holes in the main core and in grooves or holes inthe stationary armature E and is in operative relation thereto. The main coils H may be wound upon the armature alone or upon the main core E alone instead of being put upon both, as .shown in the figures. The course of the lines of force generated in the main core by the main wiring or series coil is represented by the ar rows m and is hereinafter called the series flux. The course of the lines of force generated, primarily, by the shunt-coils is repre-. sented by the arrows m, which, as shown, pass in part through armature E and in part through the regulator-armature E which may be moved by turning the screws E and so adjusted with respect to the core E as to cause a retardation or lag in the shunt of the desired amount and may be so positioned that its effect, together with the efiect of the stationary armature E, will be such as to cause a phase-displacement between the main and shunt-windings of approximately ninety degreesthat is to say, instead of bringing about nearly ninety-degrees displacement of the phases, as is necessary in a motor intended to measure current in a circuit having considerable self-induction, by means of shifting the current-phases of the motor by an inductance the action of the regulating-armature E and of the stationary armature E is such as to effect the proper lag or phase-shifting in the magnetic circuit instead of in the electric circuit-in plain words, lagging the shunt-flux. The shunt-coils N N-are of the highest inductive capacity, so as to create a self-inductive resistance of the highest possible degree of self-induction.

The registering attachment of the meter is shown at 2?, being driven by shaft .2 carried in bearings z 2 and carrying a metallic shell G under the inductive influence of the core E and the armature E, the lines of force traversing the said metallic shell and the magnetic reactions causing the said shell to rotate, as will be well understood. The rotation of the said shell may be regulated and brought to any desired constant. The various regulations may be otherwise efiected. The revolution of the registering mechanism and shell may likewise be regulated by other suitable mechanical means well understood-as, for instance, by fiy-fans, fly-Wheels, electromagnetic damping mechanism, or by regulating the magnetic field, (indicated by the arrows m.)

Having described my invention, What I claim, and desire to secure by Letters Patent, 1s

1. In an alternating-current meter of the motor type, the combination of an auxiliarily- Wound electromagnetic core of a general U or horseshoe shape, combined with main Windings laid in grooves or holes, in the said electromagnetic core, means whereby the proper phase-displacements may be obtained, and a moving part under the influence of the electromagnetic core for indicating the passage of current through the windings, substantially as described.

2. In an alternating-current meter, the combination of an iron stator of substantially U shape, a rotor, shunt and series coils acting upon the stator and an adjustable armature or keeper E for regulating the shunt magnetic fiux, whereby the magnetizations due to the coils may be brought into approximate quadrature.

GEORG HUMMEL.

Witnesses:

ERNST GLAS, EMIL I-IENZEL. 

